Method of grinding



Feb. 17, 1942. E. H. PlRoN I METHOD OF GRINDING original Filed April s, 1955 lll III lll Il I Patented Feb. 17, 1942 y`\.MirrHo-n oF amismING,- l'

` 1 l 'Emil'I'IL Piron, New York, N. Y., assigner to Tran-1y tion, a corporation of New sitf Research Corpora `Original application April 8, 1935,' 4Serial No. 15,151, now, Patent No. 2,138,506, dated Novern-A `bei' 29, `1938. Divided and this application Noe, vember 23, 1938, Serial No. 241,907

` This, invention relates to resilient wheels particularly adaptedfor use on rail vehiclesyof` the type wherein a metallictire is supportedby rubber discs in shear. This application is a division of application Serial No. 15,151, ,led April 8, 1935, for Wheels, now Patent No."2,l38,506, dated Nov.29, (1938. `y

YIt is well understood in-`thef`art that a 'rail wheelisgiven a driving fit with its` axlefso that when the Wheel is'removed for re-surfacing of its tread it is a vdifficult and expensive' `matter to replace the Wheel on its hub in exact accordance with its original alinement; vResilient wheels of the general type herein described havefbeen suggestedin numerous prior patents and some of them have, in fact, `been built, but they toro uare alsofsubje'ct, fory the mostfpart; tothe drawback .thatjthe'y must bef'b'odily removed fromv their axle'for resurfacing of the tread and for replacement of the rubber. Research by applicant indi# cates that commercial success can be attained with wheels of this type only by providing a wheel comprising a hub portion integral with one main radial metallic shear plate and the remainder of the wheel including the other main radial plate, the rubber discs and the tire carrying member all readily demountable therefrom without removing the vhub portion from the axle. This entails means to exactly center the rubber elements with respect to the hub, means for exactly centering the tire carrying member with respect to the rubber elements and the hub for if the assembly is not exact it is obvious that the tire will be eccentric with respect to its axis of rotation, and means capable of preventing relative dislocation of the several members during severe operation. l

A principal ob-ject of the present invention is to teach the method of lgrinding a wheel meeting the foregoing requirements, or in other words a wheel which uses auxiliary metallic plates bonded to each side of each rubber element and provided with dowel or locating means which are also transmitting means for both radial and tan-` gential loads.

Another and important object of this invention is to provide a method of grinding the metal tire of a resilient wheel, wherein the resiliency of the tire springing elements is obvated whereby the tire becomes rigid with respect to the hub during grinding.

Another object is to provide means for use in conjunction with a resilient wheel for holding the metal rim thereof xed with respect to the hub of the wheel.

i claim. (c1. 51,-.zs1)

Another object is to provide means for readily assembling a wheelof this type wherein the inner elements cannotl .be `readily seen for accurate placement. u v f p Other objects, and advantages will y become hereinafter more fullyapparent as reference is had to the accompanying drawing wherein my invention is illustrated and in which:

Fig. 1 is a transverse diametric section through a rail wheel constructed in accordance with my invention, n

Fig. 2 is an elevation of the wheel,

Fig. 3 is an elevationof `one of the discs, and

Fig. 4 islan elevation of the pin used in grinding operations..

vI indicatesV the Wheel hub havingy two stiff plates 2 and .3 radiating therefrom. The plate 2 is integrally secured Vto the hub I, as by Welding, and the plate 3 is .integrally secured to a collar 4 slidably mounted on the hub I. Teeth or clutch elements 5 lock the collar for rotation with the hub and a nut 6 threaded onto the' hub I retains the clutch elements 5 in engagement. It is highly desirable to build the plates 2 and 3 out of sheet metal and in order that sufficient rigidity may be obtained the outer edge 'I of each plate is ilared outwardly to'form a stiifening flange substantially normal to the main surface as shown in Fig. 1, or of other suitable shape. As a further stiffening means, conical bracing plates 8 and 9 are provided, the plate 8 being welded at its outer edge to the plate 2 and the outeredge of the plate 9 being Welded to the member 3. The inner edges of both plates 8 and 9 are turned inwardly at I0 for close fitting engagement with the hub I and collar 4 respectively, the inner edges of each plate 2, 3 being turned outwardly at II to serve as an abutting means therefor. The plates 8 and 9 are preferably welded to the hub and collar respectively.

The tire I2 is integral with a radial plate member I3 of substantially greater inside diameter than the outside diameter of that portion of the hub I which it encircles so as to be capable of radial movement with respect thereto.

In order to support the tire I2 and plate I3, elastic springing elements are interposed between the plate I3 and each plate 2 and 3. The wheel as described to this pointl is similar except for the addition of the flanges 1, to that revealed in the co-pending application of C. F. Hirshfeld, Serial Number 749,449, led October 22, 1934. The springing elements, the method of making them and the manner of wheel assembly are novel thereover.

The springing elements are composed of rubber discs 22 having plates 23 surface bonded thereto, the plates having dowel holes 30 therein.

Dowel pins 24 must therefore project from the surfaces of the plates 2 and 3 for engagement therewith. These-pins 24 are preferably'threaded at one end for engagement with similar threads in the dowel holes 25 of the plates 2 and 3. The pins 26 for the plate I3 are threaded at their midsection and extend outwardly from each surface of the plate for engagement with plates on each side thereof. `Note that `the pins 24 and 2S preferably extend entirely through' the plates 23 and that the rubber discs are hollowed out at 21 to prevent chai-lng. The advantage ,of this construction is that if -one or more dov/tels is sheared off, perchance, it can Ibe replaced.

In the described springing elements 'the ldowel pins constitute the means for transmitting both radial and tangential forces or loads. In lother Words, friction between the springing element platesand thermain plates isnotrelied upon because slippage of even a fraction of an inch' will render the wheel unt for service.

In order to further facilitate the .assembling operation, I recommend the use of one v,onmore assembly pins.28 upon which theindividual .parts may be threaded The plates 2, 3, I3 andthe springing elements are .each provided vwith small holes 29for the purpose s o that before the members are in contact th'e pins 28 are Yinserted through them ,so that when the members Aare thus pressed toward each other the dowels go into place. Even without the pins 28, the'holes 29 can be used for visually alining the plates. Removable plugs may be placed in the holes 29 of the exterior members for .normal operation. With this assembly means itis obvious that the dowel or stud members donot have to besymmetricaland uniformly spaced to `be able to readily assembly the wheel but it is recommended .iand the pins 28 lend themselves for use for this t,purpose ,as it is obvious that there can be no radial movement of the tire with respect to the hub when the pins are in place and the wheel is :normally assembled. As a matter of fact the pins for grinding iwould not be exactly the same as the assembly pins ,as they may be shorter as .showninFig 4 and a cotter pin or nut 3| would 'be .provided to prevent their displacement during rotation for the grinding.

The holes 29 may be at any desired radial distance from the inner to the outer circumference of therubber elements. They are illustrated as being outwardly of the conical plates but they do not have to be as these plates may be punched also. The position illustrated is preferred.

What is claimed is:

The method of re-surfacing the tire tread of a resilient wheel comprising a hub portion having spaced radial plate members, a tire having a plate radiating inwardly therefrom, said tire plate being separated from said hub plates by rubber-.like elements adapted to resist relative radial movementsv of said plates in shear, .said tireplate and said hub plates having -a plurality of setsof alignedholes therethrough', which consists in Vinserting a .pin through eachset of said holes whereby to rigidify said tire plate against radialmovement with respect to said hub, rand .in rotating .said Wheel about its axis while making pressure contact of said tire .tread with a grinding means.

EMIL H. PIRON. 

